Applicare la formula: $\left(a+b\right)^2$$=a^2+2ab+b^2$, dove $a=\frac{2}{3}x^5$, $b=-\frac{5}{9}x^3$ e $a+b=\frac{2}{3}x^5-\frac{5}{9}x^3$

Applicare la formula: $x^mx^n$$=x^{\left(m+n\right)}$, dove $m=5$ e $n=3$

Applicare la formula: $\left(ab\right)^n$$=a^nb^n$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=4$, $b=3$, $c=-5$, $a/b=\frac{4}{3}$, $f=9$, $c/f=-\frac{5}{9}$ e $a/bc/f=\frac{4}{3}\cdot -\frac{5}{9}x^{8}$